30results about How to "Reduce airspeed" patented technology

The invention belongs to preparation and application of a catalyst, and particularly relates to a double-layer catalyst and preparation thereof, and application of the catalyst in preparation of pyromellitic dianhydride. The preparation method comprises the following steps: respectively weighing effective quantities of active components (V2O5, TiO2, P2O5, Na2O, MoO3 and Sb2O3), compounds of other metals and whiskers, preparing solutions, preparing spraying slurry, spraying the slurry on a support, roasting, cooling and carrying out other technical steps to obtain catalysts E and G; respectively putting the catalysts G and E at a raw material gas mixture inlet end and a reaction gas outlet end; and preparing the pyromellitic dianhydride under the conditions of low air speed, low temperature and the like. The invention solves the problems of high operating condition requirements, massive product impurities, heavy color, low purity and the like, and has the advantages of low operating condition requirements, high product purity, fewer impurities and the like.

The present invention is externally heated medium and high pressure process and apparatus for synthesizing material ammonia gas with methanol and methane. The apparatus includes medium pressure combined methanol synthesizing apparatus with serially and parallelly connected towers; high pressure methanolizing apparatus comprising oil separator, water cooler and high efficiency methanol separator; and externally heated high pressure methanating apparatus comprising methanating tower, heat exchanger outside the tower, steam heater, water cooler, ammonia cooler and gas-water separator. The apparatus has the advantages of high alcohol / ammonia ratio, complete refining of synthesized material ammonia gas, low CH4 in produced inert gas, low heat consumption, etc.

A dry type desulfurization filter used for diesel engine exhaust and a preparing method thereof are disclosed. The dry type desulfurization filter is carrier-free, has a thickness of 0.1-5 mm, and is a porous device comprising 60-90% by mass of a desulfurization material and 10-40% by mass of silica sol. The desulfurization material is one selected from MnO2, Fe2O3, CaO, CaCO3, Ca(OH)2, MgCO3, K2CO3 and Li2CO3. The dry type desulfurization filter needs no carrier. Most of the dry type desulfurization filter is the desulfurization material. The desulfurization capacity is obviously increased. The pressure difference between two ends of the filter is reduced. A diesel engine is increased in combustion efficiency and enhanced in power performance. The space velocity is low, and desulfurization performance of per unit of the desulfurization filter is improved. By adding carboxymethylcellulose in a preparing process, the desulfurization material can be easily mechanically processed into a honeycomb pore structure or a triangle pore structure, a quadrilateral pore structure, a hexagon pore structure, and other polygon pore structures.

The invention discloses an inter-section high low temperature gradient alcohol-division two-stage alcohol generation method which comprises the following steps: respectively reheating fresh synthesis gas and recycle gas, mixing the fresh synthesis gas with the recycle gas, introducing the mixed gas into a first reactor, and enabling part of carbon oxides to react to obtain methyl alcohol; cooling a mixture containing synthesis gas and methyl alcohol steam output from the first reactor, guiding the mixture to flow to a first methyl alcohol separator, separating out methyl alcohol, pressurizing the separated gas, preheating, then introducing into a second reactor, and enabling part of carbon oxides to react to obtain methyl alcohol; cooling a mixture containing synthesis gas and methyl alcohol steam output from the second reactor, guiding the mixture to flow to a second methyl alcohol separator, separating out methyl alcohol, preheating the separated gas which separately serves as the recycle gas and fresh synthesis gas, mixing the recycle gas and the fresh synthesis gas, and feeding the mixture into the first reactor so as to perform next round of circulating preparation of methyl alcohol. The invention further discloses an inter-section high low temperature gradient alcohol-division two-stage alcohol generation device. The method is relatively high in single-pass alcohol net value and relatively small in circulation ratio, achieves a ton-alcohol steam yield as high as 1.2-1.3 ton, and is high in energy heat recovery amount.

The invention discloses an endothermic aviation fuel. According to the endothermic aviation fuel, a flashing point is higher than 60 DEG C, a fuel net heating value is larger than 43.0 MJ / kg, a heat sink at 750 DEG C is larger than or equal to 3.4 MJ / kg, and the thermal stability passes a JFTOT test at 355 DEG C in 300 minutes; the aviation fuel is prepared from larger than or equal to 30wt% of alkane and larger than or equal to 50wt% of cyclane, the aromatic hydrocarbon content is less than 5wt%, a bromine number is 0, and the sulphur content is less than 1 ppm. The endothermic aviation fuelhas the characters of high thermal stability, high heat value, low volatility, high heat sink and better anti-coking performance; after a compound additive is added, the performance of the aviation fuel can be further improved, especially, the anti-coking performance of the fuel at high temperatures is obviously improved.

A multi-segment chemical gas-solid reactor is composed of a pressurized external cylinder and a heated internal cylinder, which has three layers, two pot-shaped gas collectors between adjacent two layers, and two heat exchangers installed respectively in the centers of the second and the third layers. Its advantages are high purity of product, high grade of vapor and low airflow resistance.

The invention relates to bacillus licheniformis, a method for preparing a flocculating agent from the bacillus licheniformis and an application of the flocculating agent. The strain is bacillus licheniformis LZ-1 which is preserved in China General Microbiological Culture Collection Center on November 06, 2012 with preservation number of CGMCC No.6782. With the application of the bacillus licheniformis LZ-1 as well as a production method provided by the invention, a fermentation broth, which is high in flocculating activity, is obtained under the condition that an initial pH value is alkaline, and high-molecular-weight polysaccharide, which is 0.8-3.2*10<7>Da, serves as a major flocculating active ingredient. The polysaccharide flocculating agent provided by the invention has the advantages of being high in flocculating activity, low in dosage, low in production cost and the like, and the flocculating agent has a flocculating conditioning effect on sludge. The bacillus licheniformis LZ-1 fermentation broth or a product, which is extracted from the fermentation broth and contains the polysaccharide flocculating agent, can be applied to deep dewatering by sludge plate-frame pressure filtration in a mode of replacing a polyacrylamide flocculating agent, so that sewage treatment plant concentrated sludge, which is 96-98% in moisture content, is further dewatered into a sludge cake which is lower than 60% in moisture content and the size of the sludge is diminished to be 1 / 20-1 / 10 of an original size.

The invention relates to a heat exchanger for catalytic cracking of a heat recovery fuel. The heat exchanger comprises a heat recovery fuel catalytic cracking unit, wherein the heat recovery fuel catalytic cracking unit comprises a cylindrical catalytic cracker core, a fuel inlet section shell and a fuel outlet section shell, wherein the cylindrical catalytic cracker core is internally provided with an inner cavity; end covers are mounted at two ends of the inner cavity; catalyst filling holes are formed in a cylinder wall; the catalyst filling holes are respectively communicated with inner and outer surfaces of the cylinder wall; the catalyst filling holes are formed side by side along the axis direction of the cylinder wall to form hole rows; the hole rows are separately distributed along the peripheral direction of the cylinder wall to form a hole array; axial hot fluid channels are arranged between adjacent hole rows; the axial hot fluid channels are communicated with the two ends of a cylinder; the cylindrical catalytic cracker core is provided with an externally annular partition plate; and the cylindrical catalytic cracker core is divided into a fuel inlet section and a fuel outlet section by the externally annular partition plate. The heat exchanger has large fuel vapor flowing sectional area, small flowing resistance, low catalytic reaction airspeed and high transformation rate, and a catalyst is easy to replace.